... of hearing. Noise value (NRR) 25 dB, the smooth surface, with treatment, wearing health, safety, soft, comfortable, good sound effects. Improve ... The curved flanges gently “hug” the ear canal to provide an effective seal against noise that remains comfortable all day long ... respirator, gas masks , safety goggles, earplugs and safety helmet with our own brand polyGard and other OEM. These products meet ...